Add simple git wrapper.

src/Makefile

@@ -49,7 +49,7 @@ HACKERBASE-OBJS=hackerbase.o testing.o listing.o month.o period.o	\
 	 util-set-list.o util-time.o util-tag.o util-io.o		\
 	 util-string.o util-io.o util-list.o util-parser.o texts.o	\
 	 tests.o util-proc.o util-mail.o reminders.o util-format.o	\
-	 brmember-format.o logging.o specification.o
+	 brmember-format.o logging.o specification.o util-git.o
 
 .PHONY: imports
 imports: $(HACKERBASE-DEPS)
@@ -355,3 +355,8 @@ SPECIFICATION-SOURCES=specification.scm period.import.scm
 
 specification.o: specification.import.scm
 specification.import.scm: $(SPECIFICATION-SOURCES)
+
+UTIL-GIT-SOURCES=util-git.scm util-io.import.scm
+
+util-git.o: util-git.import.scm
+util-git.import.scm: $(UTIL-GIT-SOURCES)

src/util-git.scm

@@ -0,0 +1,74 @@
+;;
+;; util-git.scm
+;;
+;; Support for simple git integration.
+;;
+;; ISC License
+;;
+;; Copyright 2023 Brmlab, z.s.
+;; Dominik Pantůček <dominik.pantucek@trustica.cz>
+;;
+;; Permission to use, copy, modify, and/or distribute this software
+;; for any purpose with or without fee is hereby granted, provided
+;; that the above copyright notice and this permission notice appear
+;; in all copies.
+;; 
+;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+;;
+
+(declare (unit util-git))
+
+(module
+ util-git
+ (
+  git
+  )
+
+ (import scheme
+	 (chicken base)
+	 util-io)
+
+ ;; Valid git operating modes
+ (define git-modes
+   '((#:exit exit)
+     (#:output output)
+     (#:exit+output exit+output)))
+
+ ;; Used for actual invocation of git binary, returns two values: exit
+ ;; code and output lines
+ (define (invoke-git repo args)
+   (apply get-process-exit+output-lines
+	  "git"
+	  "-C"
+	  repo
+	  args))
+
+ ;; Curried git repo command wrapper
+ (define (git repo . defargs)
+   (let ((defmode (if (null? defargs)
+		      'output
+		      ;; Raises an error if not valid
+		      (cadr (assq (car defargs) git-modes)))))
+     (case defmode
+       ((exit)
+	(lambda args
+	  (let-values (((exit-code _)
+			(invoke-git repo args)))
+	    exit-code)))
+       ((output)
+	(lambda args
+	  (let-values (((_ output)
+			(invoke-git repo args)))
+	    output)))
+       ((exit+output)
+	(lambda args
+	  (invoke-git repo args))))))
+
+ )